Since “retirement” in June 2010, Richard has continued to work part time at the Bureau on geologic map projects and related studies that concern Cenozoic volcanism, magmatism and the Rio Grande rift in central New Mexico. Richard’s primary interest is the structural control magmatism, geometry of magma ascent and the evolution of volcanoes, including the 32.5 million-year old supervolcano at Socorro known as the Socorro caldera.

Leuth,
V.W., Chamberlin, R.M., and Peters, L., 2004, Age
of Mineralization in the Luis Lopez Manganese District, Socorro
County, New Mexico: as Determined by 40 Ar/39Ar Dating of Cryptomelane,
in press, in Tectonics,
Geochronology and Volcanism in the Southern Rocky Mountains and
Rio Grande Rift, S.M. Cather, W.C. McIntosh and S.A. Kelly (eds.),
New Mexico Bureau
of Mines and Mineral Resources Bulletin.